LangChain4j is an idiomatic, open-source Java library for building LLM-powered applications on the JVM. It offers a unified API over popular LLM providers and vector stores, and makes implementing tool calling (including MCP support), agents and RAG easy. It integrates seamlessly with enterprise Java frameworks like Quarkus and Spring Boot.
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Open-source, self-hosted enterprise & site search server built on OpenSearch. Crawls web / file / DB / cloud sources, 20+ languages, REST API, and AI/RAG & semantic search. Apache-2.0.
A Java library to use the OpenAI Api in the simplest possible way.
LLM and agent evaluation for Java & Kotlin. Runs in JUnit and CI. Spring AI, LangChain4j, Koog, Embabel, and any LLM client.
The open-source safety layer for AI agents — block unsafe tool calls, require approval, enforce budgets, audit, replay.
This Maven plugin automatically generates package-info.java files with JSpecify annotations (@NullMarked or @NullUnmarked), helping you manage nullness boundaries in your Java projects without manual boilerplate.